Astronomy, Astrophysics, Cosmology Forum

Graduate Estimating radiative cooling in high-temperature rocket exhausts

Graduate How do we know that the expansion of the universe is radially symmetric?

Graduate How do metaphysics theories explain the expanding universe?

Graduate The Issue of the Beginning (new paper by Ashtekar)

Undergrad Possible Explanations To Fermi's Paradox?

Graduate ASCL.net - Astrophysics Source Code Library

Graduate Diagramming the observable universe with tangent circles

Graduate Why do $\Lambda$CDM and Milne cosmologies predict the same universe age?

Graduate Escape velocity of a body from a black hole.

Graduate Is the universe a 3D manifold living in 4D space?

Undergrad Did ancient Greek myths encode knowledge of the Big Bang?

Graduate Is Venus retrograde or upside down, and what does the 178° tilt mean?

High School Is Alpha Centauri, the closes star to the solar system?

High School Why does Earth rotate counterclockwise when viewed from above the North Pole?

High School Is the Universe Really Spherical? And What Lies Beyond?

Graduate 'Cyclic universe' can explain cosmological constant

Graduate Are Trojans possible for other planets besides Jupiter?

Graduate Finding Water on the Moon: A Proposal for an Experiment

High School What are Some Beginner-Friendly Books on Cosmology and General Relativity?

Undergrad How do they measure the CMB temperature?

Undergrad Could life exist if atomic stability were slightly different?

Stargazing What Can You Capture in the Night Sky with Jupiter, Saturn, and Comet Photos?

Graduate Why is my paper very difficult to be published?

Graduate Infinitely small and infinitely large

• Poll

Undergrad Is a Manned Mission to Mars Beneficial for Scientific Advancement?

Graduate What is the current understanding of the origin of the universe?

Graduate Can We Understand Axis Tilts in Planetary Systems?

Graduate What heated the early universe to 1000 trillion degrees?

Graduate Radiation, propulsion and timescales for human Mars missions

Graduate Radio Waves emitted by Black Holes

Graduate Alternative theories about the origin of the universe

Undergrad Gravitational slingshotting

High School Would you see thousands of ships in trans-lunar orbit from Earth?

Graduate Is the Hubble Constant Constant?

Graduate Do solar neutrinos really change flavor?

Graduate Some questions regarding WIMPs as a DM candidate

Graduate Acceleration due to the solar wind

Graduate Does time dilation change the universe's age for fast-moving particles?

Undergrad Why do most planets orbit in roughly the same plane?

Graduate How does repulsive gravity affect spacetime geometry?

Stargazing Where should I start with astrophotography equipment?

Graduate Is a Methane-Molecule-Like Solar System Stable?

Undergrad Why does a star's gravitational force increase when it becomes a black hole?

Undergrad Relation Between Areas of Astronomy

Graduate Accelerating expansion and the Cosmological Constant

Graduate Congratulations to Christine on the new paper

Graduate Could a 150-year comet have perihelion between Mercury and Venus?

Undergrad Are we going in a particular direction?

Undergrad Drake equeation and planet finding

Undergrad Is the amount of matter in the universe infinite?

Graduate Can the gas model theory explain recent satellite observations?

Undergrad Someone want to have fun with asteroid simulation?

Graduate Driving past your opponent in a space race

Graduate Time after big bang we can observe, uncertainty principle

Graduate What if matter were holes in a solid vacuum?

High School What causes the northern lights?

Undergrad Is Our Sun Part of a Binary Star System?

High School Our universe should be called multiverse and not universe

Graduate Can the cyclic universe work with loop quantum gravity instead of string theory?

High School Why does the universe look black?

Graduate How Do Aliens and Astronomers Measure Time Differently in the Galaxy Paradox?

Graduate Knowing the environment and the creation of the universe

Undergrad Proving Pluto's Orbit Inside Neptune's - Maths Investigation

Graduate Could a Wormhole and Black Holes be Used to Reverse the Big Bang?

Graduate Is the Universe a 3D Surface of a 4D Hypersphere?

Graduate Neutrinos, can you explain them to me?

Graduate Occam's Razor and WMAP Anomalies

Graduate How Do Scientists Measure the Universe's Expansion Rate?

Graduate Calculating apparent positions of sun and moon

Undergrad What distinguishes Pre-main-sequence stars from main sequence stars?

Undergrad Why did matter dominate over antimatter after the big bang?

High School Sun's Position in Our Solar System

Graduate Do Celestial Objects Compete for Matter?

Undergrad Distance between earth and moon increasing

Stargazing Do astronomers at the 3,000 dollar level become degenerates

High School What Is the Center in Sloan Digital Sky Survey?

Undergrad Temp of a Comm Satellite in Orbit Around Earth

Undergrad Why do stars exhibit red shift and blue shift in our universe?

Graduate Tried to understand how we/ our universe came to be

Graduate Quasar variability timescales don't show expected time dilation

High School Sun's Companion Star: Nemesis Theory

Graduate What is the logical setup that determines the epoch of the CMB?

Graduate What Are Rosswog's Ideas on the GRB Mechanism?

Graduate Could all supermassive objects in the center of galaxies be SGR's post mortem?

Undergrad How do astronomers measure the angle for calculating a parsec?

Graduate Why Does a(tau) Not Equal af in This Orbital Migration Equation?

Graduate How Does Quantum Mechanics Explain the Beginning of the Universe?

Graduate The Great Attractor - What Do We Know?

Graduate Is the "chaos cloud" article from 2005 a hoax?

Undergrad Evolving Earth: Solar System Environment Over Time

High School How many places in the solar system have liquid water?

Undergrad Are white holes real or just theoretical?

Graduate The cycle of life? Fractal orbits and spin.

Graduate Is There a Preferred Lorentz Frame in the CMB?

Graduate Debate with my coworker regarding the inflationary theory

Graduate Dark Energy's effect on the curvature of space time

Undergrad Neutron star: heaviest teaspoon of matter